I am just not positive how well that range cord is going to clamp into that plug without physically looking at one of them. Here is something I know will work.
Get the plug that fits in your range outlet, should be this one:
http://www.lowes.com/lowes/lkn?ac...80-SP-L&lpage=noneThen get the female plug that your machine plugs into.
Now you will have 2 plugs with no cord.
At lowes, or home depot, they will sell some extension cord wire by the foot, it is called SJOW (it could have a different name also as long as it is for cords) cord. It is round and has braided wired. You want one with 3 wires inside it. You can get 10 gage (even 12 would be find for 20A, but the cost difference for a short cord is nominal). 10 gage is larger than 10 and 8 gage is larger yet. I would just get 10 gage if that is available, as it is most likely to clamp down well in both plugs. Just need a couple feet, unless you need it longer for some reason. Bottom line if you go in there and ask for 10-2 gage SJOW (extension cord) with ground they should have it. Stranded would be best, but solid would be ok as long as it is rated for use as an extension cord. The cord will be round. If they try to sell you a flat piece of cord / wire, it is likely romex / NM and is totally wrong for this. Make sure what they sell you is not Romex cable, just make sure it is rated for use as an extension cord.
I hope this helps and wasn't too confusing.
Jamie